• The Agate Fossil Hills where mammal fossils were excavated in the early 1900's

    Agate Fossil Beds

    National Monument Nebraska

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  • Visitor Center Hours

    The visitor center at Agate Fossil Beds will be open the following hours: Memorial Day till Labor Day Open Daily 9 am - 5 pm; Labor Day till Memorial Day Open Daily 8 am - 4 pm. Closed Thanksgiving, Christmas, and New Years Day.

Lichens

Bright orange lichen covers many rocks on the hills.

Bright orange as well as yellow, gray-blue, black and green lichen can be seen on many rocks as you walk the two trails at Agate.

The dry, rocky bluffs at Agate provide an ideal habitat for lichens. Lichen are a composite plant, consisting of fungi and algae with a symbiotic relationship. In a symbiotic relationship both plants benefit and are capable of living in places where neither one could live alone. The body of the lichen, called a thallus, has no outer covering like a leaf so air is freely exchanged across the entire surface of the plant.

Lichen are extremely slow growing, only a few millimeters per year, but live for many years if undisturbed. Lichens are a good indicator of air quality due to their method of air exchange. Some lichen are sensitive to carbon dioxide, nitrogen oxides, fluorides or ozone, alone or in combination. The sensitivity of the lichens also varies with atmospheric conditions. When the plant is wet and active, it absorbs more air and pollutants and is affected faster than when it is dry and dormant. When damaged, lichen becomes discolored because of death of the algae causing bleached lobes followed by death of the algae. The lichen decomposes into the soil within a few months after its death. Because of the longevity of lichen, they indicate environmental factors over a long period of time. Chemical analysis of the plants can give indications of levels of toxic substances which accumulate in the plants.

The lichens at Agate are generally healthy with a total of 64 species documented. Lichen grow on more than just rocks and at Agate, species of lichen are found on trees, rocks and soil. The wetland areas are densely covered with vascular plants with limited space available for lichen growth, but the thin soil on ridges provides habitat for soil lichens. The trees have several species of rare lichen that would not otherwise be found in a grassland. The most abundant locations for lichen are the rocks and rock outcroppings.

Text by Kimberly Howard, Biological Science Technician, Agate Fossil Beds National Monument.

Did You Know?

This painting hangs in the Den exhibit in the Cook Gallery.

Red Cloud, a chief of the Oglala Lakota Sioux, was one of the most photographed American Indians. More than 128 photos were taken of him during his lifetime. An oil painting of Red Cloud painted at the Agate Springs Ranch hangs in the “Den” exhibit in the James H. Cook Gallery. More...